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If you can route a shorter belt and do away with the smog pump altogether I would go with that. Otherwise the pumps usually have the main housing with a cover plate bolted to it. You need to get access to the inside of the pump, remove the internals, so that it is not pumping all time.
Only thing smog pump does .. pumps air in the cat to burn emissions better. It is past the point where ecm controls. Will have to crimp pipe at cat to close off exhaust off. Then do as case said.